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Scattered throughout multiplayer and campaign levels on Halo 2 and Halo 3 are UNSC crates, or large boxes, that contain supplies for ground based Marine forces. The contents of crates can be identified by their labels, and range from portable generators to armored boots. Although their only actual use in the game is cover from enemy fire, they do reveal a bit about the UNSC military, and play a key role in the environment of maps and campaign levels. They can also serve as cover or platform.
There is a range of different types of crates. This section contains information on all of them, ranging from smallest to largest. Kits are small crates that appear to be carried by Marine ground forces. Barrels contain liquid supplies. Small crates carry equipment used by ground troops, and large crates contain large pieces of equipment for use at fixed positions.
The first crate can be found only once or twice in the game; it appears to be a small medical kit Marine medics would use to treat the wounded. It has the word "Rescue" along with the international medical symbol. It is likely able to be found in various campaign levels at Marine positions, but it can only be found once in multiplayer on the map Foundation.
This container can be found in a Brute encampment inside the armory. It is placed under another crate so it is pretty difficult to find. There's another one on Metropolis on top of the building where Sergeant Banks and a turret are next to a medical crate. The crate has been spotted on the multiplayer map Foundation as well. Perhaps it is with a bit of dry humor that Bungie placed this small crate right next to a medical kit within the same room. It might be inspired by the notorious VX nerve agent that was in modern times before it was banned.
Type: VX 7, possibly one of Bungie's 7 references.
This crate or barrel is for emergencies. You can also find blitz cans with Hydrogen fuel.
Item: Water - Pure
This crate (or barrel) can be found all over on multiplayer maps and Marine encampments in campaign. It appears to be a barrel of water for hygiene, cleansing, drinking, etc.
It's likely this is used by Marine ground forces to fuel various equipment, including generators and Warthogs.
Gas masks are used by ground forces for protection against chemical or biological weapons, possibly for protection against the nerve gas seen above.
Serial Number: 7880-53-413-1999
Item: Gas Mask/KR3/INF/BLK
Weight: 112 LBS
The standard Marine armor in the Halo series.
Serial Number: 9325-80-548-4127
Weight: 82.8 LBS
This is for use by Marine ground forces for protection from energy and ballistic projectiles.
Serial Number: 2580-55-270-4193
Item: Body Armor/C-M/INF/W-OD
Weight: 173 LBS
Serial Number: 5893-22-418-2524
Item: Armored Boot/INF/V-OD
Quantity: 18 Pairs
Weight: 81 LBS
Perhaps the strangest box on Halo 2, it contains the Halo: Combat Evolved pistol.
Item: Pistol/M6D 12.7MM Rec. Op.
Used for base defense, this machine gun turret crate is found only on Headlong and Cairo Station.
Type/Item: M247 7.62MM Gas Op. Auto Linkless
Weight: 893 LBS
Emergency Food Prep Station
Item: Emergency Food Prep. Station
Replacement Transfer Case
A transfer case is a part of the four wheel drive system found in the Warthog. The transfer case is connected to the transmission and also to the front and rear axles by means of driveshafts. The transfer case receives power from the transmission and sends it to both the front and rear axles.
Item: Rplcmnt Transfer Case/M12LRV IDPG FT-DR
Weight: 203 LBS
Weight: 305 LBS
This portable electric generator/hydrogen fuel cell is likely used at fixed positions for power.
Item: Port EL Gen/HY F Cell 18 KV
Weight: 273 LBS
These are the racks that you receive weapons from at points in the game.
FIELD ARMORY RE-SPLY MR 5D8 LFI R3
Supply Drop Pod
Drop Pods are dropped by Pelicans to quickly deliver ammunition and weapons to soldiers.
Type: C Capsule
Halo 3 features most of the same crates as seen in Halo 2. Interestingly, the crates in Halo 3 have exactly the same labels as in Halo 2, even though the pieces of equipment they represent have been changed. Of course it's possible that the crates contain older equipment.